sushant kumar
building intelligent systems that become real products.
AI builder, systems thinker, and product-minded engineer working across agents, retrieval, voice, and applied machine learning. I care about clarity, leverage, and building software that is technically deep, thoughtfully designed, and built to last.
Recent work spans Simpplr AI, Sequoia, Sprouts AI, SquareYards, and Azuro.
- systems thinking
- applied ai
- product architecture
- design-conscious engineering
get in touch if you are building something ambitious with AI.
highlights✨
selected work
A few systems and products from recent roles.
Simpplr AI / August 2025 - Present
Comms AI
Worked on Comms AI at Simpplr, an AI-native workspace for internal communicators spanning planning, drafting, approvals, and multichannel publishing inside a governed enterprise workflow.
Sequoia / January 2025 - August 2025
AI Assist
Built task-oriented AI assist systems for benefits and people operations workflows, connecting enterprise data, retrieval, and automation.
Sprouts AI / June 2024 - January 2025
Autonomous Interview Agent
Built a production interview system that combined ASR, LLM reasoning, and TTS into a live screening workflow.
writing📝
latest writing
Notes on AI systems, research, and the craft of building with them.
June 21, 2026
MCP in production
What changes when an MCP server moves from localhost to real users, real accounts, and real permissions.
April 5, 2026
Rules I live by
A few reminders on building, clarity, taste, leverage, and the kind of work I want to live by.
August 6, 2025
Understanding GPT-OSS architecture
An in-depth look at the architecture of GPT-OSS, an open-source large language model released by OpenAI on 5th August 2025. It is a MoE GPT-2-style Transformer with 36/24 layers, 128/32 experts with top-4 routing, RMSNorm, Grouped Query Attention + RoPE attn, 131 K context via YaRN, 4-bit MXFP4 packs 120 B on 80 GB & 20 B on 16 GB, and SwiGLU activation.